Add missing channels to commands.

src/main/java/com/alttd/proxydiscordlink/bot/commands/DiscordBroadCast.java

@@ -39,7 +39,7 @@ public class DiscordBroadCast extends DiscordCommand {
 
     @Override
     public long getChannel() {
-        return 0;
+        return BotConfig.STAFF_COMMAND_CHANNEL;
     }
 
     @Override

src/main/java/com/alttd/proxydiscordlink/bot/commands/DiscordNick.java

@@ -31,7 +31,7 @@ public class DiscordNick extends DiscordCommand {
 
     @Override
     public long getChannel() {
-        return 0;
+        return BotConfig.COMMAND_CHANNEL;
     }
 
     @Override